I have a brand new domain with a brand new WordPress installation.
I am trying to import WordPress content from another site using the export / import function provided by WordPress.
When going to the new site and chosing import from WordPress, it installs the plug-in and then when I go to activate it I get the error message
The plugin does not have a valid header.
When I try to install the plug-in again, it tells me that the destination folder already exists. I can see the folder using FileZilla, but I cannot see the plug-in listed in the WordPress admin dashboard.
Additional info: I have tried uploading other plug-ins, e.g. Shareaholic and I get the same error message The plugin does not have a valid header, so the problem is not just limited to the WordPress Import plug-in.
What may be causing this problem?